Method for controlling pump transitions in a multi-mode...

Details Method for controlling pump transitions in a multi-mode... Method for controlling pump transitions in a multi-mode...

2009-04-02

2011-11-22

Williams, Joseph L (Department: 2889)

Pumps

Condition responsive control of pump drive motor

Plural pumps having separate drive motors, supply sources,...

C417S002000, C417S003000, C417S004000

Reexamination Certificate

active

08062001

ABSTRACT:
A method of pressure control for transmissions having a hydraulic circuit selectively communicating with first and second pumps via first and second regulators includes commanding communication to the hydraulic circuit to transition from the first to the second pump and the PCS to set the regulators to a high pressure-regulation level. The hydraulic circuit line pressure is raised to an elevated value exceeding a target value. The line pressure is lowered from the elevated to the target value at or after completing the transition to the second pump. The method may include transitioning communication with the hydraulic circuit from the second to the first pump. The PCS maintains the regulators at the high level and line pressure is raised to the elevated value. PCS sets the regulators to a low level, and line pressure returns to the target only at or after completing the transition to the first pump.

REFERENCES:
patent: 6551208 (2003-04-01), Holmes et al.
patent: 7010406 (2006-03-01), Sah et al.
patent: 7130734 (2006-10-01), Sah et al.
patent: 7217211 (2007-05-01), Klemen et al.
patent: 7324885 (2008-01-01), Sah et al.
patent: 7356398 (2008-04-01), Steinmetz et al.
patent: 2007/0276569 (2007-11-01), Sah et al.
patent: 2007/0284176 (2007-12-01), Sah et al.
patent: 2008/0234097 (2008-09-01), Sah

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